FF hangs, does not launch ,hangs when new tab opened.

FF hangs when launched and when new tab is opened , same is the case when launched in safe mode ,I have reinstalled the browser but the issue persisits.
EDIT: Found a folder on my desktop "old firefox data"

Previous versions of Firefox used to cause web pages to hang, freezing everything. Firefox 15.0.1 has gone one step further /
It hangs immediately, as soon as the welcome message ( and the picture showing a kind of crop circle) appears.
This means having to Force quit... I have done just that ( and relaunched ) three times, without success. I've also trashed FF and reinstalled it three times. No joy.
There may be a "fix" of some sort, but it shouldn't be necessary : Safari, Chrome, Opera, Camino, and SeaMonkey work fine "straight out of the box". So why not Firefox?
Besides, a "fix" would be impossible since I'd have to launch FF to apply it, and as I said, it hangs/freezes immediately.
I'm using a Mac, system 10.6.8.

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